Yeah, I know it's been one month since the first screenshot, but I wasn't satisfied with the result and performances.

I wrote all the installation instructions in the preview If you still have some questions, feel free to ask

Note on the QSS : This is really alpha quality. Some application may work, some simply won't. Some others do not even support QSS. For this reason, I tried to make the best use of all the QTCurve options, and custom gradients, in order to cover most of the widgets without the need of using QSS.